@import 'px2rem.scss';
$designWidth:750;

*{
    margin: 0;
    padding: 0;
}

body{
    display: flex;
}

div{
    width:px2rem(187.5);
    height:px2rem(187.5);
    border: 1px solid;
}

div:nth-child(1){
    background-color: red;
}